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1 #ifndef _ASM_IA64_PTRACE_H

2 #define _ASM_IA64_PTRACE_H

4 /*

6 * David Mosberger-Tang <davidm@hpl.hp.com>

7 * Stephane Eranian <eranian@hpl.hp.com>

9 * Suresh Siddha <suresh.b.siddha@intel.com>

10 * Fenghua Yu <fenghua.yu@intel.com>

11 * Arun Sharma <arun.sharma@intel.com>

12 *

13 * 12/07/98 S. Eranian added pt_regs & switch_stack

14 * 12/21/98 D. Mosberger updated to match latest code

15 * 6/17/99 D. Mosberger added second unat member to "struct switch_stack"

16 *

17 */

18 /*

19 * When a user process is blocked, its state looks as follows:

20 *

21 * +----------------------+ ------- IA64_STK_OFFSET

22 * | | ^

23 * | struct pt_regs | |

24 * | | |

25 * +----------------------+ |

26 * | | |

27 * | memory stack | |

28 * | (growing downwards) | |

29 * //.....................// |

30 * |

31 * //.....................// |

32 * | | |

33 * +----------------------+ |

34 * | struct switch_stack | |

35 * | | |

36 * +----------------------+ |

37 * | | |

38 * //.....................// |

39 * |

40 * //.....................// |

41 * | | |

42 * | register stack | |

43 * | (growing upwards) | |

44 * | | |

45 * +----------------------+ | --- IA64_RBS_OFFSET

46 * | struct thread_info | | ^

47 * +----------------------+ | |

48 * | | | |

49 * | struct task_struct | | |

50 * current -> | | | |

51 * +----------------------+ -------

52 *

53 * Note that ar.ec is not saved explicitly in pt_reg or switch_stack.

54 * This is because ar.ec is saved as part of ar.pfs.

55 */

58 #include <asm/fpu.h>

60 #ifdef __KERNEL__

61 #ifndef ASM_OFFSETS_C

62 #include <asm/asm-offsets.h>

63 #endif

65 /*

66 * Base-2 logarithm of number of pages to allocate per task structure

67 * (including register backing store and memory stack):

68 */

69 #if defined(CONFIG_IA64_PAGE_SIZE_4KB)

70 # define KERNEL_STACK_SIZE_ORDER 3

71 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB)

72 # define KERNEL_STACK_SIZE_ORDER 2

73 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB)

74 # define KERNEL_STACK_SIZE_ORDER 1

75 #else

76 # define KERNEL_STACK_SIZE_ORDER 0

77 #endif

79 #define IA64_RBS_OFFSET ((IA64_TASK_SIZE + IA64_THREAD_INFO_SIZE + 15) & ~15)

80 #define IA64_STK_OFFSET ((1 << KERNEL_STACK_SIZE_ORDER)*PAGE_SIZE)

82 #define KERNEL_STACK_SIZE IA64_STK_OFFSET

84 #endif /* __KERNEL__ */

86 #ifndef __ASSEMBLY__

88 /*

89 * This struct defines the way the registers are saved on system

90 * calls.

91 *

92 * We don't save all floating point register because the kernel

93 * is compiled to use only a very small subset, so the other are

94 * untouched.

95 *

96 * THIS STRUCTURE MUST BE A MULTIPLE 16-BYTE IN SIZE

97 * (because the memory stack pointer MUST ALWAYS be aligned this way)

98 *

99 */

100 struct pt_regs {

101 /* The following registers are saved by SAVE_MIN: */

102 unsigned long b6; /* scratch */

103 unsigned long b7; /* scratch */

104

105 unsigned long ar_csd; /* used by cmp8xchg16 (scratch) */

106 unsigned long ar_ssd; /* reserved for future use (scratch) */

107

108 unsigned long r8; /* scratch (return value register 0) */

109 unsigned long r9; /* scratch (return value register 1) */

110 unsigned long r10; /* scratch (return value register 2) */

111 unsigned long r11; /* scratch (return value register 3) */

112

113 unsigned long cr_ipsr; /* interrupted task's psr */

114 unsigned long cr_iip; /* interrupted task's instruction pointer */

115 /*

116 * interrupted task's function state; if bit 63 is cleared, it

117 * contains syscall's ar.pfs.pfm:

118 */

119 unsigned long cr_ifs;

120

121 unsigned long ar_unat; /* interrupted task's NaT register (preserved) */

122 unsigned long ar_pfs; /* prev function state */

123 unsigned long ar_rsc; /* RSE configuration */

124 /* The following two are valid only if cr_ipsr.cpl > 0 || ti->flags & _TIF_MCA_INIT */

125 unsigned long ar_rnat; /* RSE NaT */

126 unsigned long ar_bspstore; /* RSE bspstore */

127

128 unsigned long pr; /* 64 predicate registers (1 bit each) */

129 unsigned long b0; /* return pointer (bp) */

130 unsigned long loadrs; /* size of dirty partition << 16 */

131

132 unsigned long r1; /* the gp pointer */

133 unsigned long r12; /* interrupted task's memory stack pointer */

134 unsigned long r13; /* thread pointer */

135

136 unsigned long ar_fpsr; /* floating point status (preserved) */

137 unsigned long r15; /* scratch */

138

139 /* The remaining registers are NOT saved for system calls. */

140

141 unsigned long r14; /* scratch */

142 unsigned long r2; /* scratch */

143 unsigned long r3; /* scratch */

144

145 /* The following registers are saved by SAVE_REST: */

146 unsigned long r16; /* scratch */

147 unsigned long r17; /* scratch */

148 unsigned long r18; /* scratch */

149 unsigned long r19; /* scratch */

150 unsigned long r20; /* scratch */

151 unsigned long r21; /* scratch */

152 unsigned long r22; /* scratch */

153 unsigned long r23; /* scratch */

154 unsigned long r24; /* scratch */

155 unsigned long r25; /* scratch */

156 unsigned long r26; /* scratch */

157 unsigned long r27; /* scratch */

158 unsigned long r28; /* scratch */

159 unsigned long r29; /* scratch */

160 unsigned long r30; /* scratch */

161 unsigned long r31; /* scratch */

162

163 unsigned long ar_ccv; /* compare/exchange value (scratch) */

164

165 /*

166 * Floating point registers that the kernel considers scratch:

167 */

168 struct ia64_fpreg f6; /* scratch */

169 struct ia64_fpreg f7; /* scratch */

170 struct ia64_fpreg f8; /* scratch */

171 struct ia64_fpreg f9; /* scratch */

172 struct ia64_fpreg f10; /* scratch */

173 struct ia64_fpreg f11; /* scratch */

174 };

175

176 /*

177 * This structure contains the addition registers that need to

178 * preserved across a context switch. This generally consists of

179 * "preserved" registers.

180 */

181 struct switch_stack {

182 unsigned long caller_unat; /* user NaT collection register (preserved) */

183 unsigned long ar_fpsr; /* floating-point status register */

184

185 struct ia64_fpreg f2; /* preserved */

186 struct ia64_fpreg f3; /* preserved */

187 struct ia64_fpreg f4; /* preserved */

188 struct ia64_fpreg f5; /* preserved */

189

190 struct ia64_fpreg f12; /* scratch, but untouched by kernel */

191 struct ia64_fpreg f13; /* scratch, but untouched by kernel */

192 struct ia64_fpreg f14; /* scratch, but untouched by kernel */

193 struct ia64_fpreg f15; /* scratch, but untouched by kernel */

194 struct ia64_fpreg f16; /* preserved */

195 struct ia64_fpreg f17; /* preserved */

196 struct ia64_fpreg f18; /* preserved */

197 struct ia64_fpreg f19; /* preserved */

198 struct ia64_fpreg f20; /* preserved */

199 struct ia64_fpreg f21; /* preserved */

200 struct ia64_fpreg f22; /* preserved */

201 struct ia64_fpreg f23; /* preserved */

202 struct ia64_fpreg f24; /* preserved */

203 struct ia64_fpreg f25; /* preserved */

204 struct ia64_fpreg f26; /* preserved */

205 struct ia64_fpreg f27; /* preserved */

206 struct ia64_fpreg f28; /* preserved */

207 struct ia64_fpreg f29; /* preserved */

208 struct ia64_fpreg f30; /* preserved */

209 struct ia64_fpreg f31; /* preserved */

210

211 unsigned long r4; /* preserved */

212 unsigned long r5; /* preserved */

213 unsigned long r6; /* preserved */

214 unsigned long r7; /* preserved */

215

216 unsigned long b0; /* so we can force a direct return in copy_thread */

217 unsigned long b1;

218 unsigned long b2;

219 unsigned long b3;

220 unsigned long b4;

221 unsigned long b5;

222

223 unsigned long ar_pfs; /* previous function state */

224 unsigned long ar_lc; /* loop counter (preserved) */

225 unsigned long ar_unat; /* NaT bits for r4-r7 */

226 unsigned long ar_rnat; /* RSE NaT collection register */

227 unsigned long ar_bspstore; /* RSE dirty base (preserved) */

228 unsigned long pr; /* 64 predicate registers (1 bit each) */

229 };

230

231 #ifdef __KERNEL__

232

233 #include <asm/current.h>

234 #include <asm/page.h>

235

236 #define __ARCH_SYS_PTRACE 1

237

238 /*

239 * We use the ia64_psr(regs)->ri to determine which of the three

240 * instructions in bundle (16 bytes) took the sample. Generate

241 * the canonical representation by adding to instruction pointer.

242 */

243 # define instruction_pointer(regs) ((regs)->cr_iip + ia64_psr(regs)->ri)

244 /* Conserve space in histogram by encoding slot bits in address

245 * bits 2 and 3 rather than bits 0 and 1.

246 */

247 #define profile_pc(regs) \

248 ({ \

249 unsigned long __ip = instruction_pointer(regs); \

250 (__ip & ~3UL) + ((__ip & 3UL) << 2); \

251 })

252

253 /* given a pointer to a task_struct, return the user's pt_regs */

254 # define task_pt_regs(t) (((struct pt_regs *) ((char *) (t) + IA64_STK_OFFSET)) - 1)

255 # define ia64_psr(regs) ((struct ia64_psr *) &(regs)->cr_ipsr)

256 # define user_mode(regs) (((struct ia64_psr *) &(regs)->cr_ipsr)->cpl != 0)

257 # define user_stack(task,regs) ((long) regs - (long) task == IA64_STK_OFFSET - sizeof(*regs))

258 # define fsys_mode(task,regs) \

259 ({ \

260 struct task_struct *_task = (task); \

261 struct pt_regs *_regs = (regs); \

262 !user_mode(_regs) && user_stack(_task, _regs); \

263 })

264

265 /*

266 * System call handlers that, upon successful completion, need to return a negative value

267 * should call force_successful_syscall_return() right before returning. On architectures

268 * where the syscall convention provides for a separate error flag (e.g., alpha, ia64,

269 * ppc{,64}, sparc{,64}, possibly others), this macro can be used to ensure that the error

270 * flag will not get set. On architectures which do not support a separate error flag,

271 * the macro is a no-op and the spurious error condition needs to be filtered out by some

272 * other means (e.g., in user-level, by passing an extra argument to the syscall handler,

273 * or something along those lines).

274 *

275 * On ia64, we can clear the user's pt_regs->r8 to force a successful syscall.

276 */

277 # define force_successful_syscall_return() (task_pt_regs(current)->r8 = 0)

278

279 struct task_struct; /* forward decl */

280 struct unw_frame_info; /* forward decl */

281

282 extern void show_regs (struct pt_regs *);

283 extern void ia64_do_show_stack (struct unw_frame_info *, void *);

284 extern unsigned long ia64_get_user_rbs_end (struct task_struct *, struct pt_regs *,

285 unsigned long *);

286 extern long ia64_peek (struct task_struct *, struct switch_stack *, unsigned long,

287 unsigned long, long *);

288 extern long ia64_poke (struct task_struct *, struct switch_stack *, unsigned long,

289 unsigned long, long);

290 extern void ia64_flush_fph (struct task_struct *);

291 extern void ia64_sync_fph (struct task_struct *);

292 extern long ia64_sync_user_rbs (struct task_struct *, struct switch_stack *,

293 unsigned long, unsigned long);

294

295 /* get nat bits for scratch registers such that bit N==1 iff scratch register rN is a NaT */

296 extern unsigned long ia64_get_scratch_nat_bits (struct pt_regs *pt, unsigned long scratch_unat);

297 /* put nat bits for scratch registers such that scratch register rN is a NaT iff bit N==1 */

298 extern unsigned long ia64_put_scratch_nat_bits (struct pt_regs *pt, unsigned long nat);

299

300 extern void ia64_increment_ip (struct pt_regs *pt);

301 extern void ia64_decrement_ip (struct pt_regs *pt);

302

303 #endif /* !__KERNEL__ */

304

305 /* pt_all_user_regs is used for PTRACE_GETREGS PTRACE_SETREGS */

306 struct pt_all_user_regs {

307 unsigned long nat;

308 unsigned long cr_iip;

309 unsigned long cfm;

310 unsigned long cr_ipsr;

311 unsigned long pr;

312

313 unsigned long gr[32];

314 unsigned long br[8];

315 unsigned long ar[128];

316 struct ia64_fpreg fr[128];

317 };

318

319 #endif /* !__ASSEMBLY__ */

320

321 /* indices to application-registers array in pt_all_user_regs */

322 #define PT_AUR_RSC 16

323 #define PT_AUR_BSP 17

324 #define PT_AUR_BSPSTORE 18

325 #define PT_AUR_RNAT 19

326 #define PT_AUR_CCV 32

327 #define PT_AUR_UNAT 36

328 #define PT_AUR_FPSR 40

329 #define PT_AUR_PFS 64

330 #define PT_AUR_LC 65

331 #define PT_AUR_EC 66

332

333 /*

334 * The numbers chosen here are somewhat arbitrary but absolutely MUST

335 * not overlap with any of the number assigned in <linux/ptrace.h>.

336 */

337 #define PTRACE_SINGLEBLOCK 12 /* resume execution until next branch */

338 #define PTRACE_OLD_GETSIGINFO 13 /* (replaced by PTRACE_GETSIGINFO in <linux/ptrace.h>) */

339 #define PTRACE_OLD_SETSIGINFO 14 /* (replaced by PTRACE_SETSIGINFO in <linux/ptrace.h>) */

340 #define PTRACE_GETREGS 18 /* get all registers (pt_all_user_regs) in one shot */

341 #define PTRACE_SETREGS 19 /* set all registers (pt_all_user_regs) in one shot */

342

343 #define PTRACE_OLDSETOPTIONS 21

344

345 #endif /* _ASM_IA64_PTRACE_H */